Exhaust-valve mechanism.



C. T. DENKER. VEXHAUST VALVE MECHANISM. APPLIOATION FILED DBO. 24, 1910.

Patented Jan. 9; 1912.

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CHARLES T. DENKER, OF CHICAGO, ILLINOIS.

EXHAUST-VALVE MECHANISM.

Specification of Letters Patent.

Patented Jan. 9,1912.

Application filed December 24, 1910. Serial No. 599,081.

T 0 all whom it may concern:

Be it known that I, CHARLES T. DENKER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Exhaust-Valve Mechanisms, of which the following is a specification.

This invention relates to exhaust valve mechanisms which are particularly adapted for use with internal combustion engines, although the valve mechanism is capable of employment and will be found to be very useful and efiicient in various other types of machines or appliances.

One of the objects of this invention is the provision of a plurality of exhaust ports through which the exhaust products may be expelled from the engine cylinder, the ports being comparatively of large area in order that the cylinder may be eifectually cleaned and freed from gases and other products at each opening of the exhaust valves.

Another object is to relieve the valve operating mechanism of the excessive strains to which it is ordinarily subjected by the pressure within the engine cylinder either during the opening or closing movements of the valve, depending upon whether the valves open inwardly into the exhaust chamber against the force of the pressure therein or outwardly from the exhaust chamber with the pressure. This result is accomplished by mounting the valves so that one opens inwardly into the chamber while the other opens outwardly from the chamber, the two valves being connected exteriorly of the chamber by a connecting yoke whereby the valve opening with the pressure will assist in opening the other valve against the pressure, while the valve which is retained against its seat by the pressure will be instrumental in holding the other valve against its seat.

A further object is to prevent the undue heating of the valve stems which ordinarily interferes to a material extent with the proper seating of the valves, this being accomplished by having the valve stems disposed outside the exhaust chamber.

Still another object is to prevent expansion and contraction of the valve seats by maintaining a substantially constant temperature of the seats by means of a water jacket disposed around the exhaust chamber and in proximity to the Seats.

Additional objects are, to approximately balance the exhaust valves whereby they may be opened and closed with the minimum expenditure of power, to insure a fit of the valve disks on their seats while at the same time preventing sticking of the valves, to diminish the strain upon all parts connected with the valves and to increase the general efliciency of the machine Or engine with which the exhaust valve mechanism is employed.

For the purpose of describing and explaining my invention I have disclosed on the accompanying drawings an illustration of one concrete form in which the invention may be employed, but as the invention becomes better understood it will be obvious that it is not limited to the exact construction disclosed but is capable of variations in the size, shape, arrangement and details of construction of the various mechanical parts.

Referring to-the drawingsFigure 1 is a vertical sectional elevation of a preferred embodiment of my invention taken on the line 1-1 of Fig. 2. Fig. 2 is a horizontal iection thereof taken on the line 22 of On the drawings 5 designates generally, the casing of an exhaust apparatus surrounding the usual exhaust chamber 6. The chamber and casing may be cast integral with the engine cylinder or they may be cast separately therefrom and adapted to be secured thereto by bolts or other preferred fastening means. On the drawings I have shown the exhaust chamber and easing as detached from the engine cylinder, the inner face of the apparatus being curved, as shown in Fig. 1, to fit against the outer wall of the engine cylinder to which it may be fixedly and rigidly attached. The exhaust chamber 6 is adapted to communicate with the interior of the cylinder, and the passageway or compartment 7 is adapted to connect with the water jacket of the engine cylinder whereby a circulation of water is maintained around the exhaust chamber for the purpose of cooling the same. The partition 8 dis posed across the exhaust casing is cast integral with the casing at its ends, as shown in Fig. 1, and with the exhaust chamber at its top and bottom, as shown in Fig. 2. The discharge chamber 9 formed outside the partition 8 is provided with a laterally projecting internally-threaded boss 10 to which the ordinary exhaust pipe may be attached.

The exhaust chamber 6 communicates with the discharge chamber 9 through oppositely disposed ports 11 and 12, the port 11 being tapered interiorly of the exhaust chamber to provide a valve seat 13, and the port 12 being tapered exteriorly of the chamber 6 to provide the valve seat 14. The casing 5 has a downwardly projecting bearing stud 15 in which is slidably mounted a valve stem 16 carrying at its inner end a valve disk 17 which is locked in position on the stem by a nut 18. A stopper 19 is screwed into a threaded aperture in the opposite side of the casing 5 and in alinement with the exhaust chamber ports, said stopper providing a sliding bearing in which is mounted a valve stem 20 equipped at its inner end with a valve disk 21. The outer end of stem 20 is fixedly secured to a cross-head 22 by means of nuts 23, and the outwardly projecting portion of the valve stem 16 is likewise attached to a similar cross-head 24 by locking nuts 25. The outer ends of the cross-heads 22 and 24 are connected. by rods or posts 26 and 27 which are threaded into tapped open ings in the ends of the cross-heads and locked in position by nuts 28. The end of the valve stem 16 which projects beyond the cross-head 24 may be connected with any suitable valve operating mechanism such as the usual cam, for instance (not shown). An expansion spring 29 disposed around the stem 16 between the end of the stud 15 and the inner one of the locking nuts 25 tends to normally maintain the valve disks 17 and 21 in closed position against their seats 13 and 14, respectively. The valves may be adjusted so that they simultaneously form a tight fit against their seats by loosening the looking nuts 23 and 25 and adjusting the stems 16 and 20 longitudinally the required amount. The rods or posts 26 and 27, which, together with the cross-heads 22 and 24, form a yoke rigidly connecting the valves together are guided in their reciprocatory movements by laterally projecting ears or guideways 30 and 31 formed integrally with the side walls of the casing 5.

When the device is assembled, as shown in Fig. 1, and the parts are adjusted so that the disks 17 and 21 both fit simultaneously, closely against their seats 13 and 14, it will be evident that pressure in the exhaust chamber 6 will act against the upper face of the disk 17 and the lower face of the disk 21. The upper face of the disk 17, however, being of larger area than the lower face of the disk 21, the pressure in the chamber will tend to hold the disk 17 tightly against its seat, and the disk 21 will also be held tightly against its seat by reason of the fact that the two disks are rigidly connected together through the yoke, as above indicated. WVhen the valves are opened, during the normal operation of the machine, it will be evident that the power required to accomplish the opening movements need be only sufficient to overcome the chamber pressure upon a surface equal in area to the difference between the area of the lower face of disk 21 and the area of the upper face of disk 17. It will be evident, therefore, that the power required to operate the valves is much less than would be necessary were the valves not connected in the manner indicated.

In the construction shown the valve stems are both disposed outside the exhaust chamher so that there is no portion of the stem connecting two valve disks which is constantly exposed to the intense heat of the chamber; therefore, the liability of expansion and contraction of the stems is materially lessened and the liability of inaccua minimum. It will be evident also that the water jacket disposed around the chamber 6 is in close proximity to the valve seats so that they are cooled and maintained at a substantially constant temperature, thereby avoiding the expansion and contraction of the seats which would be apt to prevent accurate seating of the valve disks and also obviating excessive heating of the seats such as would cause sticking of the valves.

All of the parts of the mechanism are readily adjustable and replaceable and access may readily be obtained to the interior of the exhaust chamber by simply unscrewing the plug or stopper 19.

Vhat I claim is:

1. In an exhaust valve mechanism, the combination of an exhaust chamber provided with a plurality of valve seats, a valve mounted to seat against one of said seats and open into said chamber, a second valve mounted to seat against another of said valve seats and open outwardly from said chamber, and means arranged exteriorly of the chamber connecting said valves, whereby counter-balancing of the valves is effected by pressure within the chamber, substantially as described.

2. In an exhaust valve mechanism, the

combination of an exhaust chamber provided with a pair of valve seats, a pair of valves adapted to seat against said valve seats, means disposed exteriorly ofsaid chamber for rigidly connecting said valves together whereby said valves are operated a yoke arranged exteriorly of the chamber 1 and rigidly connecting said valve disks together, said yoke being adapted to reciprocate to simultaneously seat and unseat said valve disks, substantially as described.

4. In an exhaust valve mechanism, the combination of an exhaust chamber provided with a pair of valve seats, a casing disposed around said chamber, a pair of valve stems mounted in said casing and carrying upon their inner ends valve disks adapted to seat against said valve seats, a yoke arranged to reciprocate exteriorly of said casing, said valve stems being rigidly attached to said yoke whereby reciprocation of the yoke will alternately seat and unseat said valve disks, one of said disks opening into said exhaust chamber and the other opening outwardly therefrom, substantially as described.

5. In an exhaust valve mechanism, the combination of an exhaust chamber provided with a pair of oppositely disposed exhaust ports, a tapered valve seat surrounding each of said ports, a compartment adapted to contain water, arranged around said exhaust chamber to provide a water acket for cooling the valve seats, and a pair of valves connected together exteriorly of the chamber to operate simultaneously to open and close said ports, substantially as described.

6. In an exhaust valve mechanism, the combination of an exhaust chamber provided with a plurality of exhaust ports, a water jacket surrounding said chamber, a casing disposed around said jacket, a pair of valves slidingly mounted in said casing, one of said valves being disposed within said exhaust chamber and the other exteriorly thereof,

and a yoke rigidly connecting said valves and slidingly mounted exteriorly of the easing whereby the valves are simultaneously opened and closed, scribed.

7. In an exhaust valve mechanism, the combination of an exhaust chamber having oppositely disposed exhaust ports provided with tapered valve seats, a casing surrounding said chamber, a pair of alined valve stems mounted in the opposite walls of said casing, valve disks secured upon the inner ends of said valve stems and in position to seat against said exhaust port seats, a yoke arranged outside said casing to which the outer ends of said valve stems are fixedly secured whereby the valves are rigidly connected together, and means for normally retaining both of said valves in closed position, substantially as described.

8. In an exhaust valve mechanism, the combination of an exhaust chamber provided with oppositely disposed exhaust ports having tapered valve seats, the walls of said chamber being hollow to form a water chamber for cooling said valve seats, a casing surrounding said exhaustchamber and spaced therefrom, a pair of valve stems mounted in opposite walls of said casing, valve disks secured upon the inner ends of said stems in position to close said exhaust ports, a yoke slidingly mounted outside said casing and secured to the outer ends of said valve stems whereby the valves are connected, and means for normally retaining both of said valves in closed position, substantially as described.

substantially as de- GHARLES T. DENKER.

Witnesses:

G. S. SwnNsoN, CHARLES F. FITZGERALD.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

